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The beamer theme Dresden uses a so-called mini frame navigation, i. e. little circles each representing one slide. With \setbeamertemplate{mini frames}{}, you can remove these, but the space is still occupied:

Add \renewcommand*{\slideentry}[6]{} to the preamble of your document (the part between \documentclass{beamer} and \begin{document}). This empties the internal beamer macro responsible for generating the mini frames and the space around them: